Odpowiedzi

2009-12-07T18:37:22+01:00
A) P = 24 cm²
h = 4 cm P = ah a = P÷h
a = 6 cm
Obw = 4 × 6 cm = 24 cm

b)P = 20 cm²
a = 6 cm
b = 4 cm
P = ½(a+b)h
2P = (a+b)h
h = 2P÷(a+b)
h = 40÷10
h = 4 cm
2009-12-07T18:39:39+01:00
A) P=a×h
24cm²=ax4cm
a=24÷4
a=6cm
Obw=6cm×4
Obw=24cm

b)P=½(a+b)×h
20cm²=½(6cm+4cm)×h
20cm²=5cm×h
h=20÷5
h=4cm